yammat/Handler/Buy.hs

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-- yammat - Yet Another MateMAT
-- Copyright (C) 2015 Amedeo Molnár
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as published
-- by the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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module Handler.Buy where
import Import
import Handler.Common
import Text.Blaze.Internal
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import Text.Shakespeare.Text
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getBuyR :: UserId -> BeverageId -> Handler Html
getBuyR uId bId = do
mTup <- checkData uId bId
case mTup of
Just (user, bev) -> do
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master <- getYesod
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(buyWidget, enctype) <- generateFormPost
$ renderBootstrap3 BootstrapBasicForm
$ buyForm
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defaultLayout $
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$(widgetFile "buy")
Nothing -> do
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setMessageI MsgUserOrArticleUnknown
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redirect HomeR
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postBuyR :: UserId -> BeverageId -> Handler Html
postBuyR uId bId = do
mTup <- checkData uId bId
case mTup of
Just (user, bev) -> do
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((res, _), _) <- runFormPost
$ renderBootstrap3 BootstrapBasicForm
$ buyForm
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case res of
FormSuccess quant -> do
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if quant > beverageAmount bev
then do
setMessageI MsgNotEnoughItems
redirect $ BuyR uId bId
else do
let price = quant * (beveragePrice bev)
let sw = price > (userBalance user)
runDB $ update uId [UserBalance -=. price]
runDB $ update bId [BeverageAmount -=. quant]
checkAlert bId
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master <- getYesod
liftIO $ notifyUser user bev price master
case sw of
False -> do
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setMessageI MsgPurchaseSuccess
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redirect HomeR
True -> do
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setMessageI MsgPurchaseDebtful
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redirect HomeR
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_ -> do
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setMessageI MsgErrorOccured
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redirect HomeR
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Nothing -> do
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setMessageI MsgUserUnknown
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redirect HomeR
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notifyUser :: User -> Beverage -> Int -> App -> IO ()
notifyUser user bev price master = do
case userEmail user of
Just email ->
liftIO $ sendMail email "Einkauf beim Matematen"
[stext|
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Hallo #{userIdent user},
Du hast gerade beim Matematen für #{formatIntCurrency price}#{appCurrency $ appSettings master} #{beverageIdent bev} eingekauft.
Viele Grüsse,
Der Matemat
|]
Nothing ->
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return ()
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getBuyCashR :: BeverageId -> Handler Html
getBuyCashR bId = do
mBev <- runDB $ get bId
case mBev of
Just bev -> do
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master <- getYesod
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(buyCashWidget, enctype) <- generateFormPost
$ renderBootstrap3 BootstrapBasicForm
$ buyForm
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defaultLayout $
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$(widgetFile "buyCash")
Nothing -> do
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setMessageI MsgItemUnknown
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redirect HomeR
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postBuyCashR :: BeverageId -> Handler Html
postBuyCashR bId = do
mBev <- runDB $ get bId
case mBev of
Just bev -> do
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((res, _), _) <- runFormPost
$ renderBootstrap3 BootstrapBasicForm
$ buyForm
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case res of
FormSuccess quant -> do
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if quant > beverageAmount bev
then do
setMessageI MsgNotEnoughItems
redirect $ BuyCashR bId
else do
master <- getYesod
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let price = quant * (beveragePrice bev + appCashCharge (appSettings master))
runDB $ update bId [BeverageAmount -=. quant]
updateCashier price "Barzahlung"
checkAlert bId
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let currency = appCurrency $ appSettings master
setMessageI $ MsgPurchaseSuccessCash price currency
redirect HomeR
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_ -> do
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setMessageI MsgItemDisappeared
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redirect HomeR
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Nothing -> do
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setMessageI MsgItemUnknown
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redirect HomeR
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checkData :: UserId -> BeverageId -> Handler (Maybe (User, Beverage))
checkData uId bId = do
mUser <- runDB $ get uId
mBev <- runDB $ get bId
case mUser of
Just user -> do
case mBev of
Just bev -> return $ Just (user, bev)
Nothing -> return Nothing
Nothing -> return Nothing
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buyForm :: AForm Handler Int
buyForm = areq amountField (bfs MsgAmount) (Just 1)
<* bootstrapSubmit (msgToBSSubmit MsgPurchase)